Merge pull request #87 from awslabs/updateReadMe

update ReadMe about newly added Credential Provider:ECSTaskRoleCreden…

Author: JonathanHenson

README.md

@@ -9,16 +9,16 @@ AWS SDK for C++ is in now in General Availability and recommended for production
 the development efforts by submitting pull requests and sending us feedback and ideas via GitHub Issues.
 
 ## Getting Help
-Please use these community resources for getting help. We use the GitHub issues for tracking bugs and feature requests.
-* Ask a question on StackOverflow and tag it with the `aws-sdk-cpp` tag. 
-* If it turns out that you may have found a bug, please open an issue
-* Open a support ticket with [AWS Support]( https://console.aws.amazon.com/support/home#/)
- 
- 
-## Opening Issues
-If you encounter a bug with the AWS SDK for C++ we would like to hear about it. Search the [existing issues]( https://github.com/aws/aws-sdk-cpp/issues) and see if others are also experiencing the issue before opening a new issue. Please include the version of AWS SDK for CPP, Compiler, Compiler Version, CMake version, and OS you’re using. Please also include repro case when appropriate.
- 
-The GitHub issues are intended for bug reports and feature requests. For help and questions with using AWS SDK for C++, please make use of the resources listed in the [Getting Help]( https://github.com/aws/aws-sdk-cpp#getting-help) section. Keeping the list of open issues lean we can respond in a timely manner.
+Please use these community resources for getting help. We use the GitHub issues for tracking bugs and feature requests.
+* Ask a question on StackOverflow and tag it with the `aws-sdk-cpp` tag. 
+* If it turns out that you may have found a bug, please open an issue
+* Open a support ticket with [AWS Support]( https://console.aws.amazon.com/support/home#/)
+ 
+ 
+## Opening Issues
+If you encounter a bug with the AWS SDK for C++ we would like to hear about it. Search the [existing issues]( https://github.com/aws/aws-sdk-cpp/issues) and see if others are also experiencing the issue before opening a new issue. Please include the version of AWS SDK for CPP, Compiler, Compiler Version, CMake version, and OS you’re using. Please also include repro case when appropriate.
+ 
+The GitHub issues are intended for bug reports and feature requests. For help and questions with using AWS SDK for C++, please make use of the resources listed in the [Getting Help]( https://github.com/aws/aws-sdk-cpp#getting-help) section. Keeping the list of open issues lean we can respond in a timely manner.
 
 
 ### Introducing the AWS SDK for C++ from AWS re:invent 2015
@@ -455,7 +455,7 @@ You can use the AWSCredentialProvider interface to provide login credentials to
 The default credential provider chain does the following:
 * Checks your environment variables for AWS Credentials
 * Checks your $HOME/.aws/credentials file for a profile and credentials
-* Contacts the EC2MetadataInstanceProfile service to request credentials
+* Contacts the ECS TaskRoleCredentialsProvider service to request credentials if Environment variable AWS_CONTAINER_CREDENTIALS_RELATIVE_URI has been set. Otherwise contacts the EC2MetadataInstanceProfileCredentialsProvider service to request credentials
 
 The simplest way to communicate with AWS is to ensure we can find your credentials in one of these locations.